Study questions platform-wide or filter by specific tests with correct answers revealed.
Which philosopher is known for the statement 'Man is by nature a political animal'?
Aristotle famously argued that human beings are meant to live in a 'polis' or city-state.
Dehydrohalogenation of an alkyl halide is typically carried out with:
Alcoholic KOH (strong base in ethanol) promotes E2 elimination to form alkenes. Aqueous KOH favors substitution; conc. H₂SO₄ can cause elimination but also other reactions; Zn dust is for dehalogenation (vicinal dihalides).
Down any group, acid strength increases due to weakening of E–H bond. Therefore:
\(\text{H}_2\text{Se} > \text{H}_2\text{S}\) (Se is below S)
So saying \(\text{H}_2\text{S} > \text{H}_2\text{Se}\) is incorrect — it reverses the correct trend.
HI > HBr > HCl is correct (bond strength decreases down group 17). \(\text{H}_2\text{Te} > \text{H}_2\text{S}\) is also correct.
At what pH does the enzyme catalase show maximum activation?
Catalase is an enzyme that breaks down hydrogen peroxide into water and oxygen. It is found in many living cells and works best at a near-neutral pH. The optimum pH for catalase is approximately 7. At pH 1,3 or 5 (acidic conditions), the enzyme denatures or shows reduced activity.
Sign in to join the conversation and share your thoughts.
Log In to Comment